I am trying to add a reference to a helper DLL to my ANTS Load project, but I only seem to be allowed to choose from a prepopulated list of DLLs when I choose "Add Reference..." How can I add a reference to my DLL?

No problem -- Visual Studio for applications will allow you to create a reference to your dll if you copy it into the ANTS Load program folder. The VSA implementation included with ANTS is missing the 'browse' button you'd normally find in the full version of Visual Studio.